The Lisbon Treaty is clearly complicated and there's a whole world of misinformation doing the rounds already for added good measure. So maybe my handy step-by-step guide will help you decide...
Step 1: Find out what way Sinn Féin would like you to vote.
Step 2: Vote the opposite way.
Quick, efficient, no reading a pile of euro-guff or listening to daft debates and, most importantly, guaranteed to be the right decision.